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Askar f/3.9 Full-Frame Reducer for FRA400 and FRA500 Flatfield Astrograph

Name: Askar f/3.9 Full-Frame Reducer for FRA400 and FRA500 Flatfield Astrograph
Brand: Askar Sharpstar
SKU: FRA400Red
Price: 299 EUR

The ASKAR full-frame 0.7x focal length reducer improves the FRA400´s and FRA500´s focal ratio from f/5.6 to f/3.9, halving the exposure time

The reducer offers a corrected image field up to full-frame size format

Screw connection via the M68x1 thread on the FRA400 focuser

The focal length is reduced from 400 mm to 280 mm resp. from 500 mm to 351 mm for a larger field of view

Working distance 55 mm from the M48x0.75 connection thread

2" filter thread available on the connection adapter

Intermediate thread: M58x0,75 male thread on the corrector

Note: The telescope is not included in the scope of delivery.

Manufacturer: Askar Sharpstar

Product number: FRA400Red

EUR 299,00RRP EUR 369,00you save 19% (EUR 70,00)

incl. 19 % VAT (DE)

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excl. 6.95 € shipping costs (DE)

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Askar f/3.9 Full-Frame Reducer for FRA400 and FRA500 Flatfield Astrograph

The ASKAR full-frame 0.7x focal length reducer improves the FRA400´s and FRA500´s focal ratio from f/5.6 to f/3.9, halving the exposure time

The reducer offers a corrected image field up to full-frame size format

Screw connection via the M68x1 thread on the FRA400 focuser

The focal length is reduced from 400 mm to 280 mm resp. from 500 mm to 351 mm for a larger field of view

Working distance 55 mm from the M48x0.75 connection thread

2" filter thread available on the connection adapter

Intermediate thread: M58x0,75 male thread on the corrector

Note: The telescope is not included in the scope of delivery.

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Technical data..
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Askar F3.9 full-frame focal reducer

The new Askar FRA400 F3.9 full-frame reducer reduces the effective focal length of the telescope by a factor of 0.7x. The original f/5.6 apo becomes an f/3.9 apo. Its exposure time is significantly shorter, it is reduced to about 50%. The field of view becomes considerably larger.

The FRA400Red was developed for use with the FRA400 and FRA500 flatfield refractors and offers good correction with these telescopes, even when full-frame size sensors are used. The working distance from the M48x0.75 thread to the camera sensor is 55 mm. The camera adapter is equipped with a 2" filter thread.

Video: Mounting the reducer on the telescope

Excellent image quality

The ]shot was taken with a FRA400, the reducer and a ZWO ASI6200. The total exposure time was two hours.

Suitable for:	FRA400 and FRA500 flatfield apo
Focal length reduction:	Factor 0.7x
Working distance:	55 mm from the M48x0.75 connection thread
Intermediate thread:	M58x0.75 external thread
Working distance from the M58 external thread:	71.8 mm
Length of the M58x0.75 thread:	5 mm
Length of the reduction adapter from M58 to M48:	16.6 mm

Askar Reducer

Manufacturer / Importeur:	Teleskop-Service Ransburg GmbH
Street:	Von-Myra-Str. 8
ZIP / City:	85599 Parsdorf
Country:	Germany
Telefon number:	+49 89 99228750
Email:	info@teleskop-service.de
Website:	www.teleskop-service.de